Actuator control device

A method of controlling switching of a shift range by driving an actuator and moving an engaging member in a drive system including an actuator having a drive source, and a detent mechanism having a plurality of valley portions and a peak portion separating the valley portions, and an engaging member movable between the valley portions when an output shaft is driven by the actuator, comprising

• controlling a drive of the actuator;
• determining, based on sensor information, that the engaging member passes over the peak portion when moving the engaging member to a target valley portion corresponding to a target range;
• and
• estimating that the engaging member reaches a range of the target range corresponding to the target range at a peak passing over determination timing, which is the timing at which it is determined that the engaging member passes over the peak portion.

An actuator control device in a drive system including an actuator having a drive source, and a detent mechanism having a plurality of valley portions and a peak portion separating the valley portions, and an engaging member movable between the valley portions when an output shaft is driven by the actuator and that controls switching of a shift range by driving the actuator and moving the engaging member, comprising

• a computer including a processor and a memory that stores instructions configured to, when executed by the processor, cause the processor to
• control a drive of the actuator;
• determine, based on sensor information, that the engaging member passes over the peak portion when moving the engaging member to a target valley portion corresponding to a target range;
• and
• estimate that the engaging member reaches a range of the target range corresponding to the target range at a peak passing over determination timing, which is the timing at which it is determined that the engaging member passes over the peak portion.